Grate.



A. W. WOOD.

GRATE.

APPLICATION FILED JULY 6, 1910v 1,O55,-1 14, Patented Mar. 4, 1913.

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ARTHUR W. WOOD, OF HOUSTON, MINNESOTA.

Specification of Letters Patent.

Patented Mar. 4, 19113.

Application filed July 6, 1910. Serial No. 570,565.

ployed with stoves and furnaces that take.

wood or coal as fuel.

One object of the invention is the provision of a grate one of thebearing members of which is formed to provide an air duct and aplurality of hollow grate bars suspended by the bearing members andhaving their open ends in communication with the air duct.

Another object is the provision of a grate including a plurality ofpivoted grate bars the surfaces of which are flat and perforated andmeans for tilting said grate bars.

Vith these and other objects in view, which will more fully hereinafterappear, the present invention consists in certain novel details ofconstruction and arrangement of parts, hereinafter fully described,illustrated in the accompanying drawings, and more particularly pointedout in the appended claim, it being understood that various changes inthe form, proportion, size, and minor details of the device may be made,within the scope of the appended claim, without departing from thespirit or sacrificing any of the advantages of the invention.

In the accompanying drawings, forming part of the specification ;Figure1 is a plan view of the device. Fig. 2 is a longitudinal sectional viewon the line 2-2 of Fig. 1. Fig. 3 is a sectional end View on the line3-3 of Fig. 1. Fig. 4 is a detail perspective of one of the hollow gratebars with end portions of the top plate thereof broken away anddisclosing the pivots. Fig. 5 is a detail perspective of one end portionof one of the hollow grate bars showing thev top plate thereof in raisedposition.

Similar numerals of reference are employed to designate correspondingparts throughout.

5 and 6 denote bearing members or bars which are positioned at oppositesides to support the grate bars. The member or bar 5 is a channel ironand is disposed against one of the furnace walls to form an air conduit7 and has a vertical side cut-away to provide passages 8 and to receivethe ends of a part of the grate bars and the air flowing through thepassage 7 is adapted to enter said grate bars through the passages 8.

\Vhat will subsequently be termed the tilting grate bars are designatedin general by the numeral 9. These grate bars are rectangular in crosssection and correspond in length approximately to the distance be--tween the bearing members 5 and (3. The grate bars 9 are provided with aplurality of transverse openings extending through the opposite flatfaces of the bars to permit the air to pass from the space below thegrate into the fire-box. The tilting grate bars 9 are arranged in spacedrelation to each other, the space thercbetween, when the flat surfacesof the bars are in a horizontal plane, being equal to the width of onegrate bar, or substantially so. By reference now to the drawings, itwill be seen that the opposite ends of the grate bars 9 are provided ontheir lower faces with depending lugs 10, said lugs having openings forthe reception of pivot pins 11 which pass through the openings of thelugs and into oppositely disposed openings in the hearing members 5 and6. \Vith this construction it will be manifestthat the grate bars arepivotally connected to the bearing members 5 and G.

In order that the tilting bars may be simultaneously moved the followingconstruction is employed z-By reference now to Fig. 2 it will be seenthat the medial portions of the bars 9 are provided with transverselydisposed lugs 1.2, and depending from said lugs are hangers 13. Thelower ends of the hangers are pivotally connected to a common connectingrod 14;, one end of which extends through the ash pit door opening ofthe furnace or through any other suitable opening in the vicinity of theash pit, and is connected to one end of an operating rod 15. \Vith thisconstruction it will be manifest that by moving the operating rod in onedirection the tilting grate bars 0 will be likewise moved to assume therequired angle to the bearing members 5 and 6.

The spaces between the tilting grate bars l'eCQlWE what willsubsequently be termed hollow grate bars. Since these members are allidentical in construction a description of one will be sufficient.

By reference now to the drawings it will be seen that each of the hollowgrate bars comprises an inclined bottom designated by the numeral 16,said bottom being oblong in cross section and rising from the oppositelongitudinal sides thereof are side walls 17 and 18. The side walls 17and 18 correspond in length approximately to the dis tance between theopposite outer faces of the bearing members 5 and 6, the opposite endportions of said side walls being undercut, as shown at 19, the saidundercuts being of such depths that the portions of the side wallsbetween the undercuts will correspond in length approximately to thedistance be tween the opposite inner faces of the bearing members 5 and6. The opposite end portions of the hollow grate bars are received bytransverse recesses formed in the upper sides of the bearing members 5and 6. By the provision of these recesses the hollow grate bars are heldagainst lateral movement.

The hanger bars 13 are provided with notches 13 which are adapted toengage the basal edges of the hollow grate bars 16, whereby said gratebars 16 may be agitated.

By reference now to the drawings it will be seen that the smaller endsof the hollow grate bars are sealed with end Walls 20, the said smallerends bearing on the smaller bed plate 6, while the opposite or largerends are in alinement with the ports 8 of the larger bearing member 5.

The space between the opposite end portions of the side walls 17 and 18of each of the hollow grate bars receives end pieces 21 and 22, the saidend pieces corresponding approximately in width to the widths of thebearing members 5 and 6 and are so arranged that the upper surfaces willbe in a plane with the upper edges of the side walls 17 and 18. Thehollow grate bars are provided with pivoted closure plates 23 supportedby the end pieces 21 and 22. Since these closure plates are allidentical in struc ture a description of one will be suflicient. Thevertical side of the bearing member 5 which is cut-away to receive theends of the hollow grate bars, is indicated in dot-ted lines in Figs. 1and 3.

By reference now to the drawings it will be seen that each of theclosure plates is oblong in contour and cross section and correspondsapproximately in length and width to the space between the end pieces 21and 22 and side walls 17 and 18. The closure plates 23 are provided ontheir opposite ends and adjacent to one side with pintles 24 which arereceived by openings in the opposed inner ends of the end pieces 21 and22. The closure plates are somewhat greater in thickness than thethickness of the end pieces and are so positioned that their uppersurfaces will extend above the plane of the upper edges of the sidewalls 17 and 18. The upper faces of the closure plates are providedthroughout their lengths with longitudinal V-shaped grooves 25 andformed in the lowest points of said grooves are a plurality-of spacedair inlet openings 26, which extend through the lower face of theclosure plate. Extending beyond one end of the closure plate andadjacent to the side thereof remote from the pintles 24: is a stop 27,which enters a transverse recess 28 formed in the upper face of thebearing member 6, and serves to limit the downward movement of theclosure plate.

In the operation of the device and when coal is to be used the operatingrod 15 is moved until the tilting grate bars are at an angle to thebearing members 5 and 6. It will be obvious that the tilting grate barswill be turned to a greater angle to the bearing members 5 and 6 whenfurnace or large coal is to be used than when coal of smaller size is tobe employed. lVhen wood is to be used as fuel the tilting grate bars areturned so that their opposite fiat faces will lie in a horizontal planeand in a plane with the upper edges of the side walls of the hollowgrate bars. It will be seen, by reference to Fig. 1, that when thetilting grate bars are so turned, a substantially flat surface will bepresented through the cooperation of the tilting and hollow grate bars.l/Vhen forced draft is used the air passes through the bearing member 5thence through the ports 8 and into the hollow grate bars and upwardlythrough openings 26, air also passing through the openings of thetilting grate bars from the ash pit. Air flowing through the conduit 7in the chan nel iron bearing member 5 will pass through the openings 8into the hollow grate bars and flow through the openings 26 thereof.

By the provision of the pivotal closure plates it will be manifest thatthe hollow grate bars may be cleaned in an expeditious manner after theclosure plates are moved upwardly and outwardly.

From the foregoing, it is evident that I have provided a device which iscomparatively simple in structure and inexpensive in manufacture,embodying few parts and these so arranged that the danger of derangementwill be reduced to a minimum.

I claim A grate comprising end supporting members, one of said membersbeing a channel iron providing an air conduit, hollow grate barsprovided with a series of openings therein, the side wall of said endsupporting member being cutaway to receive the ends of said hollow gratebars, said grate bars being under-cut at their ends to prograte bars,and means for operating said vide end extensions overhanging the saidhangers to tilt said second grate bars. I 10 side wall, said grate barsprovided with In testimony whereof I aflix my signature. closurespivotally supported by said end exin presence of two witnesses.

tensions, a series of grate bars pivoted be- ARTHUR W. WVOOD. tween saidhollow grate bars, hangers con- \Vitnesses:

nected with said grate bars and provided MERRILL ABRAMsoN,

with notches adapted to engage said first D. CLINTON DYER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

